Comparison of Transversus Abdominis Plane Block and Erector Spinae Plane Block in Inguinal Hernia Repair

ESP block will be performed at the finishing of surgery under spinal anesthesia. A convex ultrasound transducer will be placed in a longitudinal parasagittal orientation 2-3 cm lateral to T10 spinous process. The erector spinae muscles will be identified superficial to the tip of T10 transverse process. The patient's skin will be anesthetized with 2% lidocaine. A 22-gauge 10-cm needle will be inserted using an out-plane superior-to-inferior approach to place the tip into the fascial plane on the deep (anterior) aspect of erector spinae muscle. The location of the needle tip will be confirmed by visible fluid spread lifting erector spinae muscle off the bony shadow of the transverse process. A total of 30 mL of bupivacaine/lidocaine mixture will be injected.

TAP block will be performed at the finishing of surgery under spinal anesthesia. A linear ultrasound transducer will be placed to lateral aspect of abdomen. A 22-gauge 10-cm needle will be inserted using an out-plane superior-to-inferior approach to place the tip into the fascial plane between transversus abdominis and internal oblique muscles..A total of 30 mL of bupivacaine/lidocaine mixture will be injected.

Numeric Rating Scale (NRS) pain score will be recorded and followed by 0., 1.-3.-6.-12.-18.-24.hours. it is planned that the patient will continue to follow the hourly NRS score in ward. Intramuscular diclofenac will be administered in this period if NRS 4 and if it is over, intravenous 0.5 mg / kg meperidine will be administered if NRS score is 4 or more after 2 hours. Salvage analgesic needs and times will be noted in detail, and the use of rescue analgesics, as well as NRS scores at designated hours, will be kept in a statistical evaluation.